Logo Search packages:      
Sourcecode: xar version File versions  Download package

zxar.c

/*
 * Copyright (c) 2005 Rob Braun
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Rob Braun nor the names of his contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * 03-Apr-2005
 * DRI: Rob Braun <bbraun@opendarwin.org>
 */
/*
 * Portions Copyright 2006, Apple Computer, Inc.
 * Christopher Ryan <ryanc@apple.com>
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <zlib.h>
#include "config.h"
#ifndef HAVE_ASPRINTF
#include "asprintf.h"
#endif
#include "xar.h"
#include "filetree.h"
#include "io.h"

typedef struct _gzip_context{
      uint8_t           gzipcompressed;
      uint64_t        count;
      z_stream    z;
} gzip_context;

#define GZIP_CONTEXT(x) ((struct _gzip_context *)(*x))

int xar_gzip_fromheap_done(xar_t x, xar_file_t f, xar_prop_t p, void **context);

int xar_gzip_fromheap_in(xar_t x, xar_file_t f, xar_prop_t p, void **in, size_t *inlen, void **context) {
      const char *opt;
      void *out = NULL;
      size_t outlen, offset = 0;
      int r;
      xar_prop_t tmpp;
      
      /* on first run, we init the context and check the compression type */
      if( !GZIP_CONTEXT(context) ) {
            *context = calloc(1,sizeof(struct _gzip_context));
      
            opt = NULL;
            tmpp = xar_prop_pget(p, "encoding");
            if( tmpp )
                  opt = xar_attr_pget(f, tmpp, "style");
            if( !opt ) return 0;
            if( strcmp(opt, "application/x-gzip") != 0 ) return 0;
            
            GZIP_CONTEXT(context)->gzipcompressed = 1;
            inflateInit(&GZIP_CONTEXT(context)->z);
      }else if( !GZIP_CONTEXT(context)->gzipcompressed ){
            /* once the context has been initialized, then we have already
               checked the compression type, so we need only check if we
               actually are compressed */
            return 0;
      }
            

      outlen = *inlen;

      GZIP_CONTEXT(context)->z.next_in = *in;
      GZIP_CONTEXT(context)->z.avail_in = *inlen;
      GZIP_CONTEXT(context)->z.next_out = out;
      GZIP_CONTEXT(context)->z.avail_out = 0;

      while( GZIP_CONTEXT(context)->z.avail_in != 0 ) {
            outlen = outlen * 2;
            out = realloc(out, outlen);
            if( out == NULL ) abort();

            GZIP_CONTEXT(context)->z.next_out = out + offset;
            GZIP_CONTEXT(context)->z.avail_out = outlen - offset;

            r = inflate(&(GZIP_CONTEXT(context)->z), Z_SYNC_FLUSH);
            if( (r != Z_OK) && (r != Z_STREAM_END) ) {
                  xar_err_new(x);
                  xar_err_set_file(x, f);
                  xar_err_set_string(x, "Error decompressing file");
                  xar_err_callback(x, XAR_SEVERITY_FATAL, XAR_ERR_ARCHIVE_EXTRACTION);
                  return -1;
            }
            offset += outlen - offset - GZIP_CONTEXT(context)->z.avail_out;
            if( (r == Z_STREAM_END) && (offset == 0) )
                  break;
      }

      free(*in);
      *in = out;
      *inlen = offset;
      return 0;
}

int xar_gzip_fromheap_done(xar_t x, xar_file_t f, xar_prop_t p, void **context) {

      if( !context || !GZIP_CONTEXT(context) )
            return 0;

      if( GZIP_CONTEXT(context)->gzipcompressed){
            inflateEnd(&GZIP_CONTEXT(context)->z);          
      }

      /* free the context */
      free(GZIP_CONTEXT(context));
      *context = NULL;
      
      return 0;
}
int xar_gzip_toheap_done(xar_t x, xar_file_t f, xar_prop_t p, void **context) {
      xar_prop_t tmpp;
      
      if( GZIP_CONTEXT(context)->gzipcompressed){
            deflateEnd(&GZIP_CONTEXT(context)->z);          
            
            if( GZIP_CONTEXT(context)->count ) {
                  tmpp = xar_prop_pset(f, p, "encoding", NULL);
                  if( tmpp )
                        xar_attr_pset(f, tmpp, "style", "application/x-gzip");
            }
      }

      /* free the context */
      free(GZIP_CONTEXT(context));
      *context = NULL;
      
      return 0;
}

int32_t xar_gzip_toheap_in(xar_t x, xar_file_t f, xar_prop_t p, void **in, size_t *inlen, void **context) {
      void *out = NULL;
      size_t outlen, offset = 0;
      int r;
      const char *opt;

      /* on first run, we init the context and check the compression type */
      if( !GZIP_CONTEXT(context) ) {
            *context = calloc(1,sizeof(struct _gzip_context));
            
            opt = xar_opt_get(x, XAR_OPT_COMPRESSION);
            if( !opt )
                  return 0;
            
            if( strcmp(opt, XAR_OPT_VAL_GZIP) != 0 )
                  return 0;
            
            GZIP_CONTEXT(context)->gzipcompressed = 1;
            deflateInit(&GZIP_CONTEXT(context)->z, Z_BEST_COMPRESSION);
            if( *inlen == 0 )
                  return 0;
      }else if( !GZIP_CONTEXT(context)->gzipcompressed ){
            /* once the context has been initialized, then we have already
            checked the compression type, so we need only check if we
            actually are compressed */
            return 0;
      }
            
      outlen = *inlen/2;
      if(outlen == 0) outlen = 1024;
      GZIP_CONTEXT(context)->z.next_in = *in;
      GZIP_CONTEXT(context)->z.avail_in = *inlen;
      GZIP_CONTEXT(context)->z.next_out = out;
      GZIP_CONTEXT(context)->z.avail_out = 0;

      do {
            outlen *= 2;
            out = realloc(out, outlen);
            if( out == NULL ) abort();

            GZIP_CONTEXT(context)->z.next_out = out + offset;
            GZIP_CONTEXT(context)->z.avail_out = outlen - offset;

            if( *inlen == 0 )
                  r = deflate(&GZIP_CONTEXT(context)->z, Z_FINISH);
            else
                  r = deflate(&GZIP_CONTEXT(context)->z, Z_SYNC_FLUSH);
            offset = outlen - GZIP_CONTEXT(context)->z.avail_out;
      } while( GZIP_CONTEXT(context)->z.avail_in != 0 );

      free(*in);
      *in = out;
      GZIP_CONTEXT(context)->count += *inlen;
      *inlen = offset;
      return 0;
}

Generated by  Doxygen 1.6.0   Back to index